I agree. To be clear, I'm not saying they're definitely negative. Just that they need to be confirmed.
It's similar to when NFL players kept citing "tainted supplements", they need to take responsibility.
There's lots of things that could cause it. As I understand it the lab test shows whether the readings are consistent with any declared medication. I don't know what the rules are around what they can and can't take.
You almost hope it's positive as the riders names are out there now.